A·sa·ma 
(ə-sämə), Mount
(ə-sämə), Mount A volcano, 2,568 m (8,425 ft) high, of central Honshu, Japan, near Nagano. One of the largest volcanoes in Japan, it erupted violently in 1783.
- on the make
- on the march
- on the market
- on the mend
- on the money
- on the move
- on the nose
- on the off chance
- on the onehand
- on the order of
- on the other hand
- on the outs
- on the part of
- on the prowl
- on the qui vive
- on the rack
- on the rag
- on-the-record
- on the right foot
- on the road
- on the rocks
- on the ropes
- on the run
- on the same wavelength
- on-the-scene